[1.2.X] Fixed #15395 -- Documented the modules/import paths for the various...

[1.2.X] Fixed #15395 -- Documented the modules/import paths for the various decorators in `django.views.decorators`. Thanks to slinkp for the report.

Backport of [15671] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15672 bcc190cf-cafb-0310-a4f2-bffc1f526a37